DAB KVC, Инструкция по установке и обслуживанию

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ENGLISH
21
Fault Check (possible cause) Remedy
−
Verify that supply voltage is at an
acceptable valve.
−
Check whether any moving parts
are scraping against fixed parts.
Eliminate the cause of the scraping.
The motor turns with difficulty.
−
Check the state of the bearings.
Change any worn bearings.
−
Check that all the phases are
present.
Restore the missing phase.
−
Look for possible open or dirty
contacts in the protection. Change or clean the component
concerned.
The (external) motor protection
trips immediately after starting.
−
Look for possible faulty insulation
of the motor, checking the phase
resistance and insulation to earth. Change the motor casing with the
stator or reset any cables
discharging to earth.
−
Ensure that the environment
temperature is not too high.
Provide suitable ventilation in the
environment where the pump is
installed.
−
Check the calibration of the
protection. Calibrate at a current value suitable
for the motor absorption at full load.
−
Check the state of the bearings. Change any worn bearings.
The motor protection trips too
frequently.
−
Check the motor rotation speed.
−
Check priming.
−
On three-phase motors, check that
the direction of rotation is correct. Invert the connection of two supply
wires.
−
Difference in suction level too high.
−
The diameter of the intake pipe is
insufficient or the horizontal stretch
is too long.
Replace the intake pipe with one
with a larger diameter.
The pump does not deliver.
−
Foot valve or intake pipe blocked. Clean the foot valve and the intake
pipe.
−
The intake pipe or the foot valve is
taking in air.
Check the suction pipe, repeat the
priming operations. The pump does not prime.
−
Check the slope of the suction
pipe. Correct the inclination of the intake
pipe.
−
Foot valve or impeller blocked.
Remove clog. Replace the impeller
if weared down.
− The diameter of the intake pipe is
insufficient. Replace the pipe with one with a
larger diameter.
The pump supplies insufficient flow.
−
Check that the direction of rotation
is correct.
Invert the connection of two supply
wires.
−
Intake pressure too low.
The pump flow rate is not constant.
−
Intake pipe or pump partly blocked
by impurities. Remove clog.
−
Leakage in the intake pipe.
The pump turns in the opposite
direction when switching off.
−
Foot valve or check valve faulty or
blocked in partly open position. Repair or replace the faulty valve.
−
Check that the pump and/or the
pipes are firmly anchored.
−
There is cavitation in the pump. Reduce the intake height or check
for load losses.
−
The pump is running above its
plate characteristics. Reduce the flow rate.
The pump vibrates and operates
noisily.
−
The pump is not turning freely.
Check the state of wear of the
bearings.